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论文类型：期刊论文

发表时间：2017-05-02

发表刊物：MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

收录刊物：SCIE、EI

卷号：693

页面范围：145-150

ISSN号：0921-5093

关键字：Nano-sized SiC; In-situ reaction; Inter-locking structure; Mechanical property; Ultra-high temperature ceramic composite

摘要：ZrB2 powders with nano-sized SiC synthesized by in-situ reaction were used to improve the sintering behavior and the mechanical properties of hot-pressed ZrB2-based ultra-high temperature ceramic composites. Microstructure analysis indicated that the mean size of ZrB2 and SiC particles was about 300 nm and 40 nm, respectively. The nano-sized SiC particles homogeneously distributed on the surfaces of ZrB2 particles. The introduction of nano-sized SiC via in-situ reaction significantly improved the densification process. In the ZrB2-based ceramic composites, the ZrB2 phase formed an inter-locking structure, which was beneficial to the improvement of mechanical properties. The dominant mechanisms for the improved mechanical properties are attributed to the plate-like ZrB2 grain pull-out, crack branching and crack deflection along the grain boundaries.